From what I have heard, they should be adding the mass editing down the road, but I think you guys should all make sure to email them and make your voices heard so they understand the urgency. Maybe take a week off from playing DK in protest. This isn't a big deal on Fanduel, since there are no late swaps, but it is an issue on DK. I do believe that they will police it correctly so that no one has the ability to edit, this is actually somewhat trivial on their site to detect, if someone edits more than 1 lineup less than 30 seconds than their previous edit it will likely trigger an alert. We do know they have this technology in place, as they "tested" it occasionally on our users and would receive this message:
So to sum up, we will retain the ability to mass enter lineups on DK, but Mass editing if it comes will be a little further down the road.